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Finding the Fourth Proportional to 130,991.96, 180,790.78 and 77,290.28

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Solution

The fourth proportional to 130,991.96, 180,790.78 and 77,290.28 is: 106,673.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,991.96 : 180,790.78 = 77,290.28 : x
  2. Step 2: Convert to fraction form
    130,991.96/180,790.78 = 77,290.28/x
  3. Step 3: Cross multiply
    130,991.96x = 180,790.78 × 77,290.28
  4. Step 4: Simplify right side
    130,991.96x = 13,973,370,007.62
  5. Step 5: Solve for x
    x = 13,973,370,007.62/130,991.96
  6. Step 6: Final answer
    x = 106,673.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.